Salt AB has zinc blende structure- The nearest distance between A 2- B -2 ions is 2-5 A- The edge length of AB unit cell is A- 2-5 A -B- 3-5 A -C- 5-0 A -D- 5-77 A -

The correct option is D 5.77 A^∘In ZnS structure, S^2 ions (anions)occupy FCC lattice point amp; Zn^2+ ions (cations) occupy alternate tetrahedral voids Th ...

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Byju's Answer

Standard XII

Chemistry

Introduction to Imperfections in Solids

Salt AB has z...

Question

Salt AB has zinc blende structure. The nearest distance between $A^{2} + & B^{- 2}$ ions is $2.5 \circ A$ . The edge length of AB unit cell is

2.5 A^{\circ}

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3.5 A^{\circ}

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5.0 A^{\circ}

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5.77 A^{\circ}

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Solution

The correct option is D $5.77 A^{\circ}$
In ZnS structure, $S^{2 -}$ ions (anions)occupy FCC lattice point &
$Z n^{2 +}$ ions (cations) occupy alternate tetrahedral voids
The distance b/w corner & Td void is corner & Td void is $\frac{1}{4} t h$ of body diagonal $= \frac{\sqrt{3} a}{4} =$ Nearest distance between cation & anion is $2.5 A^{\circ}$
$∴$ edge length $a = \frac{2.5 \times 4}{\sqrt{3}} \circ A = 5.77 \circ A$

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Salt AB has zinc blende structure. The nearest distance between A2+&B−2 ions is 2.5 ∘A. The edge length of AB unit cell is

Salt AB has zinc blende structure. The nearest distance between $A^{2} + & B^{- 2}$ ions is $2.5 \circ A$ . The edge length of AB unit cell is